I have been studying lighting techniques in my free time while I wait to buy my first DSLR, a Nikon D5300 (I plan to wait and see if there are any deals for Black Friday or Cyber Monday). I have come across several articles that mention the D5300 lacks high-speed-sync (Auto FP Flash, AFP) and external flash control with the built-in flash.
I don't think the external flash control is a huge deal, since I can use a radio-unit if I needed to. However, the lack of AFP seems limiting. While I don't anticipate taking too many action shots, I was planning experiment with shooting a portrait outdoors during the day, and using a large aperature to blur the background. This might require shooting at a higher speed than the camera's 1/200th sec. maximum sync speed.
Do you have any suggestions on getting around this problem? Would mounting a neutral density filter do the trick? Does the radio control unit add HSS functionality even though the body doesn't support it?